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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec7aedf44772787690ac3962b6309f0f3652708f728485af5de2a693d13a2d4' 
  AND token = '/SPoC0zpScz/z/H24khmI7sE5wWT9HHog04EmhZvxDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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