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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37a068fca874aa858c6707da873dc2d1552390c36d546f0a8b9674887cc6953' 
  AND token = 'RAPv4jygdzQ/tES3VR0Ov778aZCgf5l0k8VyWjNPpXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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