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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f47a5bf4fc41d526c0ab35190461e032b51451f256e9279f4b2789d234d7ab' 
  AND token = 'nNGc3pt84gO7dRByUnP+Cg3u+NsnKP5KCqx8aY+h8dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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