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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45bba891ef495df514b40eb32c478b7bb377bc9cbae14bdd09ff3f632ab76fc' 
  AND token = 'hZWz+aSYSjo//MmzXasYNiW03nkt80dZ+VTTczEQ7Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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