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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd85bcb5095a92623f0a862c91ce37153cf9cff1bcd3392f8f13015b7895c98e' 
  AND token = '3qM2XarEUY4FUvupIoe9Mo4Vf20/eGhfG4Euda72Fl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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