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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb28eac9ea4525afe7ba795824cde97014f38d8423ef0c97cfc235011d4ca4de' 
  AND token = '8xWLeyJOI+rN+12yJJdOl6Hh6s+TupD3oryFCVvyzQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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