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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17cf1c38e2107f7405a86fe71ce3decbe14f361d7cac8a1a433a5a3891ac1a5' 
  AND token = '1gW8GHMUVr6bFdAYICHO/tMMs5XRlwqdjr8IHex6t+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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