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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a495838aa19f49659d083b498330f90ead64e8ebb3e6eb381df9a4753ac103a' 
  AND token = 'G8k5Zpj9eHTcLq28KaFtsV9S+arXsnfHlKk05dHM7cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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