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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3614d318515c273278abe2932e492d8af9695748b8249789ac0baf5eefa2b8c9' 
  AND token = 'qFWHFmi7/1DctL7lev7kQol3Ax2zwpB0Pnpx1PEV57M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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