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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8880f62032f29b9653e08a1fe5c0d01f33197d8baa8dc2e66bef292d9964f5d0' 
  AND token = 'Dk7bs57uBzUS7HW2c4tlX66h7hcmy3ulRwXsve2CChA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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