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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ad5960359ebc8d122ab5d27bb7d8511a953d9328903e920b8c84ed98133573' 
  AND token = 'mamXTjFSP51pnJiKVF/Nx0TYpKwb/oYS7oVuNcmknJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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