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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0e778e9ff5fc7b69ca5cf2e08bff5b78fd93a8107748681355f3fa77f28dc5' 
  AND token = 'PpabFsCYpkqpcLcgNOALNIHjBE0Go6Z07oy6Un+ZB1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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