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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c0aa92e31981bd78503f6f9f8ec589412ae1c6570933ffbf983f36e999b09f' 
  AND token = 'uP4zqOynLJ7EZL4ckt428Eu0PEzVrckBBgW7uSybzYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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