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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f908473632681b3ae143f52f084e1a390e9f3ed1042e0ff3a587cbbe5f98d2a8' 
  AND token = 'SpfvEMrgHqQ9/7PJX8rx+5J2D1s2HVx266i/SIjMDOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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