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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ee804caf47cddd1826594d95768249f6bd849cd80bf4288bf90c306a36fb6c' 
  AND token = 'l1j4X4N8LgkgkkMA/WiCWR/pDMC8iunf+rm8qMdw8xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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