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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97f08ed36c0aa419bd0cc27dd74bff22df3b04b271e26196a044e982d7c5161' 
  AND token = 'yf7y0kdd19fic5y35zE4aWLGpRBCdvgcrqspVxToPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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