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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa027b5dd766cbf92d81f3bb668cf09cfb75998e4efe5997acdfa389203761a' 
  AND token = '0w1leoRwFPlMMkvwZt4cQu5H95qyfChr8cYX1l4xLrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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