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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5903fe345f08b3555c574b458fc58e99f9e791e47ae8d734f723b12b6570b6' 
  AND token = 'pnCYo72o+JnIhecaT8BuXCh3Agrtkd/djr6dVnb0U0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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