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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd8ef3400b508c166f24b32b2d4a3b3f241f0ed4ceed8eeed31ae028be7fb91' 
  AND token = 'X6afTTy736jut3HmIJVHyBJYWcREf7ffgc7CAfPQs+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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