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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9da2f0f02de747495098ff2e0802ce8442a0f14e3710f8439f0d7f96081a68' 
  AND token = 'kUjPPauHEAPdkoG3jmZv9A4RCAgK63ZW9I6udYWEvHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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