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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b1bd99d3fda46545501bbea90826bd8a86a829ccd1f175a2458dce6883beba' 
  AND token = 'whigsPS7N5OW37Od5R5c5CDCgI6r31D8QlEjFEi8g40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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