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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efdde9a041cfe1c311696fa47a1b903b6dcc7bc2c96009e125c5c194384fd95' 
  AND token = 'E9fm2LIX6YCjStTeQCMwtJ3l7Wiae0jQK82lXszBqDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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