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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d54770f17e3b1219baaacc0321392b94b7b2bce899ffc8403ab2dc1d10c83da' 
  AND token = '27hQoT3BsCe56DX2hPV6IxTG2RsEvOOQ0c306t4QuBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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