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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da1acba64d63a531e8e25431a320d0b63f4a3ae88b8ec30ea3b2b3a1655cb01' 
  AND token = '5xBwDkPb5+9Nat4005mJCrXhPePsQRFzDsCJC5J8Lh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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