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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31d275f08a15f768b7f635211b42a7130d3ea8180add34c8c4b40ad19f51d27' 
  AND token = 'fcNqMPQjtY3BgEJeTgSpMskkL2D70o464Nbc0VdM8bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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