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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c028d52d2cb53d21126e1a21c92eecb7d6cc041116110f00ddbaa3a88f81e11' 
  AND token = 'u1PgCJgvg+Nl/QgpwtiSbrUaGqnoHp8kxFbplEX62g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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