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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd817e3fff5d36fdbfdbc2326edd1c992b028ab7edd58e0a1529bbc11ccd9f224' 
  AND token = 'eoYbTLHWNIDG82RjS2E1DgqZl8f1N8ycmRLwlGDvs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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