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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9a32327b5fd503596bba99d262a43977db73a147c3fba988af676c18424852' 
  AND token = 'i9tBTh+1nYR0C+3N7MK/4U4rK4cY4rjOLss+D8dAmg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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