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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9efec4572af809825b90df6b57ab8396a8f777ba6b56250080ac5763ba382a' 
  AND token = 'ECrFz9BbR13uUd59ei6wJKrtCzj3Ks9Utkp4vJDI5XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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