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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84275c0960342f3cd6dd5f09999f22263fce9ef7dd8c8824fb9244e166bf7743' 
  AND token = 'bHIZXSnlf3x43spm5oEw4RygPBizAQ1WlCjXh5RSeCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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