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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f556046154c00acff7645326e49bba45a5e6f1ee37dbde6154b4f0c00506b942' 
  AND token = 'UjGI1WLWyHhdovgeEViQ3p9pfL+x3ia4ShmdChPY2XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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