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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49751f5da0ef48b55f6d82ebd1c7f02ee522d40805fee15b2333bc38ccc3b38a' 
  AND token = '5G4wD6Wy6thTDDA1g1o6r7yjCIwKd+l3JkTro26RylQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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