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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c67a1435f9335f1ccd4b11e2a369c64a16f5aeda7326dfa2ca37551a7fc398' 
  AND token = 'HWUm4XUs/TXL9pnWkb3d6YG5UtBOcpkKr66nmytDGao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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