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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b977ca5f14a1349713147a785ec00d59f7d882c38a4edea0811a9685e07ec0c3' 
  AND token = 'bkkw8mRhhVIshsOzUCzLK+j0XZPhBmrWORVK1Ib9eh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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