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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c0962edb6dc8ff7a21afa8748f8d8c9d3ea129c4fdd4ce5d1b13db632f4866' 
  AND token = '6+OvRLrZ3Y3hH2nzh7KMQI43IobL7ESV63nhcU2VMvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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