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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6944109916f46e1bcf2e9e8871a950fe60676e72bc28c40a67b5f152870659f' 
  AND token = 'h1oQAEoVtii4jxIP+EYDKqbF+RAzS4a2hxFRJ7mXWYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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