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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a93d804afdab026e08fe692fe74ffccb559f262d94bbd2f873037f36506ad80' 
  AND token = 'Y9yyIML/xtwp8KrLTZCo22TimUkQhwC3UKYHKOjYAQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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