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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5b18c7b08631150654aa75bf7b558c02e5772e8df641775fc61e13fb05ee8e' 
  AND token = 'K8XnmKNrbkMwlZ2HpxKooGwl014adiGJZjsqMOl6aHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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