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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287d44024d193e20ce156ff85174201031a1ab2f2052cac0e1b21a100a7003ef' 
  AND token = 'VPyZMLTaqhy7AHjCzNGMcqCeeXQkSxDltJjShYnXDLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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