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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bd2970a94f5a2e6b6bb70eb824dbb09cbd517d72f922b13e0a2e4285197b43' 
  AND token = 'RFsc+U766+j40N8beNQOnLxluSps6jBko1M0vf2v39c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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