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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7501a1771008d1d18c8d3aa3d9b0669522cceb667ae029f0ba7bab362273e1c' 
  AND token = 'rGKEtBuQOh2vDK0nqX4mFN+zN95kso+KsX9MdbczKZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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