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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b5ca602bf910333521ad8e3072c5abc89d105144f05e547b31bf120a551cc6' 
  AND token = 'UR05n92ZHOCi2RI+8B1NbD1k6udkfVz73ps+0gtuolM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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