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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55ba4dbe32711c88ff1200a017621afc4f3881f9cc4593b04c168642dc14c50' 
  AND token = 'pd7JlNVqCSNRCxHWPi/H9xOlWAFNT84dESe/BFFU18g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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