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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82985b9b0675a2447ae4d4d02f7da74acd6ecdf234604251f65eb390f8d5dfa' 
  AND token = 'M96optkvUkJwjczK5aFD849C1mPvGEtBAfhX31sF+B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}