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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952d066e076e9d651fd32ac137ae3fcae30b370458cd4900e6f095568c2900c0' 
  AND token = 'cBlKmUiscBDZ7S3kv3sLIbZSYFSkBplQjeOc6S4+HbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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